ARK's Brush Tips turn any Z-Vibe® into the ultimate sensory toothbrush. The Hard Brush Tip (yellow) has firm bristles, to be used as a transition to the eventual use of a regular toothbrush. Use it for tactile and proprioceptive input to the tongue, cheeks, palate, and lips during oral stimulation and/or dental care. When used with a Z-Vibe or Z-Grabber handle (sold separately), the added vibration can have a soothing and calming effect for individuals with sensory issues. Made in the USA, medical grade, FDA compliant No BPA, PVC, lead, phthalates, or latex Each tip measures approximately 2.25" in length and just under .5" in diameter Sold individually Dishwasher-safe To be used with the Z-Vibe (sold separately) Caution: this therapeutic tool should be used under adult supervision at all times.